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Question
Define the term Effective length of a magnet
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Solution
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Fill in the blank
To light a table lamp and to run a refrigerator, we use ______ as the source of electricity.
Match the following
| Column A | Column B |
| A) Steel | 1) to store magnets |
| B) Soft iron | 2) temporary magnet |
| C) Use in electric bell | 3) permanent magnet |
| D) Magnetic keepers | 4) electromagnet |
Define the following term regarding a bar magnet:
Magnetic field
Define the following term regarding a bar magnet:
Effective length
Select the correct option:
The place around a magnet where its influence can be detected is called:
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Name the metal used for E and F.
Give scientific reason:
Soft iron is used to make electromagnets.
Differentiate between:
Primary and secondary cell.
Thamizh Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?
